Patent US3964878A successfully refreshed from Google Patents.
US3964878A
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US
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Cemented carbide employing a refractory metal binder and process for producing same
Assignee: GTE Sylvania Inc
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Filing: 1973-06-06
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Granted: 1976-06-22
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Expires: 1993-06-06
Abstract
Abstract A cemented carbide composition is disclosed that consists essentially of a carbide of a refractory metal selected from Group 4, Group 5, and Group 6 metals and mixtures thereof and a binder selected from one of the foregoing refractory metals and from 0.5 to 1.5% by weight of an iron group metal. A process for producing these materials is also disclosed which comprises forming an intimate admixture of the desired refractory metal carbide, the desired refractory metal, an iron group metal, a paraffin wax and a volatile mixing aid. Thereafter, the mixing aid is removed by heat. The resulting powder particles are compacted to a predetermined shape and heated at a temperature sufficient to remove the wax and thereafter are heated at a temperature above the melting point of the catalyst and thereafter elevated in temperature to achieve suitable sintering.
Inventors
- 👤 William Scheithauer, Jr.
- 👤 Glenn Albert Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:00
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0031; C22C29/00; C22C29/02; C22C29/06; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A cemented carbide composition consisting essentially of from about 15 to about 50 percent by weight of a refractory metal carbide selected from carbides of refractory metals of the Group 4, Group 5, and Group 6 metals and mixtures thereof, from about 50 to about 85 percent of a binder selected from said refractory metals and from about 0.5 to about 1.5% of an iron group metal selected from iron, nickel and cobalt.
Claim 2
Dependent Claim
73 words
A cemented carbide composition consisting essentially of from about 15 to about 50 percent by weight of a refractory metal carbide selected from carbides of refractory metals of the Group 4, Group 5, and Group 6 metals and mixtures thereof, from about 50 to about 85 percent of a binder selected from said refractory metals and from about 0.5 to about 1.5% of an iron group metal selected from iron, nickel and cobalt.
Claim 3
Dependent Claim
13 words
A composition according to claim 1 wherein said iron group metal is nickel.
Claim 4
Dependent Claim
31 words
A composition according to claim 2 wherein said refractory metal carbide is selected from titanium carbide, zirconium carbide, chromium carbide, molybdenum carbide, tungsten carbide, vanadium carbide, tantalum carbide and mixtures thereof.
Claim 5
Dependent Claim
13 words
A composition according to claim 3 wherein said refractory metal binder is tungsten.
Claim 6
Dependent Claim
21 words
A composition according to claim 4 wherein said refractory metal carbide is a solid solution of tungsten carbide and titanium carbide.
Claim 7
Dependent Claim
171 words
A process for producing a cemented carbide composition comprising: a. forming an admixture by suitable mixing of refractory metal carbide, a refractory metal, a wax, an iron group metal, and a volatile mixing aid; said refractory metal carbide being from about 15 to about 50%, said refractory metal being from about 50 to 85% and said iron group metal being from about 0.5 to about 1.5%, said percentages being based upon the weight percent of the combined total weight of said carbide, said refractory metal and said iron group metal; b. removing said mixing aid; c. compacting the resulting powder to a predetermined shape; d. heating said shapes at a first temperature for a sufficient time to remove said wax; e. heating said shapes at a second temperature above the melting point of said iron group metal for at least about two hours; and thereafter f. heating said shapes at a sintering temperature from about 1850°C to about 1950°C for a time sufficient to achieve complete sintering of the resulting particles.
Claim 8
Dependent Claim
171 words
A process for producing a cemented carbide composition comprising: a. forming an admixture by suitable mixing of refractory metal carbide, a refractory metal, a wax, an iron group metal, and a volatile mixing aid; said refractory metal carbide being from about 15 to about 50%, said refractory metal being from about 50 to 85% and said iron group metal being from about 0.5 to about 1.5%, said percentages being based upon the weight percent of the combined total weight of said carbide, said refractory metal and said iron group metal; b. removing said mixing aid; c. compacting the resulting powder to a predetermined shape; d. heating said shapes at a first temperature for a sufficient time to remove said wax; e. heating said shapes at a second temperature above the melting point of said iron group metal for at least about two hours; and thereafter f. heating said shapes at a sintering temperature from about 1850°C to about 1950°C for a time sufficient to achieve complete sintering of the resulting particles.
Claim 9
Dependent Claim
24 words
A process according to claim 6 wherein said iron group metal is nickel and said first temperature is from about 200°C to about 350°C.
Claim 10
Dependent Claim
17 words
A process according to claim 7 wherein said second temperature is from about 1475°C to about 1550°C.
Claim 11
Dependent Claim
12 words
A process according to claim 8 wherein said mixing aid is hexane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |